【摘要】 5.12汶川地震中发生了多起桥梁落梁震害,每起落梁事故有各自的现象与成因。根据桥梁结构构造特点以及落梁现场调查,对都江堰庙子坪大桥和百花大桥的落梁过程及成因展开分析,认为庙子坪大桥中的一孔落梁起因于联间振动位移差及碰撞,而百花大桥第5联整体倒塌实际也始于端部落梁。文中进一步探讨了地震中落梁的一般特征,并提出若干防落梁措施。更多还原

【Abstract】 In the Great WenChuan earthquake,many bridges were unseated due to ground shaking and permanent ground deformations resulting from the earthquake and other reasons.Based on field reconnaissance and considerations on structural characteristics of each bridge,the cause and process of the unseating phenomenon in MiaoZiPing and BaiHua Bridge were deduced.It was observed that the movement difference and collision between beam ends are the reason for the unseating of MiaoZiPing Bridge,while the unseating of the side span in BaiHua Bridge induces the whole structure to collapse.Moreover,the common characteristics for bridge unseating and the use of seismic restrainers were discussed.更多还原